And what if the third party is somehow the son?

Naah man, we saw first hand with mama how her son got run over in half, guts spilling out while alive. And I'll be damn if the author ever found a way to have some way to have the son still alive after that, unless some supernatural shit is involved in this, there's just no way

we saw him get torn in half intenstines splattered out on the road yk damn well